Malicious PDF — malware analysis report

Static analysis result for SHA-256 3303b98b1f9b157c…

MALICIOUS

PDF

72.9 KB Created: 2021-03-10 21:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 970d0f74ea21008e7f705683d80cf917 SHA-1: 9ae7ef6c810dba398a1363a8185f7acfef1ace23 SHA-256: 3303b98b1f9b157cc51897e197fd1f49d01f7a2cdbadb91705efc668db7e932d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/123?utm_term=escape+room+answers+level+207 PDF link annotation
    • http://domen3.club/definition_of_the_american_dream2w6yo.pdfIn PDF document text
    • http://topcreditmonitoring.info/1985_suzuki_250r_quadracer_parts2xk65.pdfIn PDF document text
    • http://uaregroup.com/guided_day_tours_from_rome_to_veniceqtjs4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_600a663feea4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_5fd646fd403f7.pdfIn PDF document text
    • http://apsmall.space/the_chainsmokers_paris_mp4_videonqw1w.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/cdhhBif/pencil_drawing_ideas_landscape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_60418d878b63a.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/3698370449313oea.pdfIn PDF document text
    • http://laura-egorova.ru/south_carolina_sea_duck_hunting_guidwuhuh.pdfIn PDF document text
    • http://jakartapro.xyz/faxazagimokakada6fyoj.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/if9jelu/9754260980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_601a38ce2626f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_00a75718aadd4f9893367041b24e9568.pdf?index=trueIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_61e6da2b954e491aaafc1593068c1205.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_f0084fb5446f4365b8667e915e4edcaf.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_54a5097fb3df46cea8978d0ae7e07e64.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 5544 bytes
SHA-256: 99d4ab3f5c695363499e25e4960db7b94d08bbe305f4ba5dc94ac9566933cfc0
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 11052 bytes
SHA-256: 8a9a5345d038eda926c7b8bb6f007561a82806be2592b9a7e3e1cb923686e6a1

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